THE REACTION GAMMA-GAMMA-]PI-0-PI-0 AND CHIRAL LOOPS

Publication Date

1988

Journal or Book Title

PHYSICAL REVIEW D

Abstract

Two-photon production of a neutral-pion pair is uniquely predicted near threshold by the theory of chiral symmetry. The prediction vanishes at the tree level and is nonzero only at one-loop order, yielding a finite result without any unknown counterterms. In this paper we calculate the cross section for both on-shell and off-shell photons, as both cases can both be studied at e+e- storage rings. This reaction is the most accessible process which directly probes the loop structure of chiral-SU(2) symmetry.

Comments

Published version is located at http://prd.aps.org/abstract/PRD/v37/i9/p2423_1

Pages

2423-2430

Volume

37

Issue

9

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